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Late Visean tholeiitic rocks of the Mechraa Ben Abbou Basin (Northern Rehamna, Western Meseta, Morocco): Petrography, geochemistry and geodynamic setting

Author Affiliations

  • 1LCA, Department of Geology, Faculty of Sciences Ben M'Sik, Hassan II University of Casablanca, Morocco
  • 2MAD, High School of Technology, Sidi Bennour- University of Chouaib Doukkali, El Jadida, Morocco
  • 3LCA, Department of Geology, Faculty of Sciences Ben M'Sik, Hassan II University of Casablanca, Morocco

Int. Res. J. Earth Sci., Volume 7, Issue (2), Pages 1-12, May,25 (2019)

Abstract

The magmatic activity related to the Moroccan Variscides is expressed in the Mechraa Ben Abbou Basin (Northern Rehamna, Western Meseta, Morocco) by Visean basic rocks represented by gabbros, dolerites and basalt sills. Basic rocks display an equigranular textures for the gabbros, intersertal ophitic and subophitic for the dolerite and the basalts are mostly porphyritic and have vacuoles within the microlithic matrix. These rocks show a simple primary mineral association made up of plagioclase, clinopyroxene, and iron oxides, chlorite and calcite as secondary minerals. Thirteen geochemical analyses carried out on these rocks suggest a tholeiitic continental affinity. These rocks were originated in a post-collisional scenario that have inherited their orogenic signature after the subduction of the Rheic Ocean during Late Devonian.

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